Seeing as you don't do it the normal way I'll totally admit it's not as hard as the regular way but it still came down to the last few seconds and took me quite a lot of attempts. More details on Reddit, too:

They patched Liadri with regeneration during Phase 1, so this doesn't work any more. Tried a few more times with varying degrees of success, but I decided to finish the meta with Tier 3 gambits on Deadeye without too much of a problem. Next time...